wayland: constraint the pointer onto visible monitors when running on evdev

Use the new Clutter hook to make sure the pointer never enters
the dead area caused by the different monitor sizes.

You don't realize how much X is doing for you until you lose it...

https://bugzilla.gnome.org/show_bug.cgi?id=706655

src/wayland/meta-wayland-pointer.h

@@ -60,7 +60,7 @@ struct _MetaWaylandPointer
   guint32 grab_serial;
   guint32 grab_time;
 
-  wl_fixed_t x, y;
+  wl_fixed_t x, y; /* TODO: remove, use ClutterInputDevice instead */
   MetaWaylandSurface *current;
   struct wl_listener current_listener;
   wl_fixed_t current_x, current_y;
@@ -69,7 +69,8 @@ struct _MetaWaylandPointer
 };
 
 void
-meta_wayland_pointer_init (MetaWaylandPointer *pointer);
+meta_wayland_pointer_init (MetaWaylandPointer *pointer,
+			   gboolean            is_native);
 
 void
 meta_wayland_pointer_release (MetaWaylandPointer *pointer);